AppGameKit
Godot Engine
MonoGame
BYOND
ct.js
Corona SDK
Construct 2
RPG Maker
React Native Roadmap
NativeBase
AppGameKitGodot Engine - Feature-packed 2D and 3D open source game engine.
NativeBase - Experience the awesomeness of React Native without the pain
MonoGame - MonoGame is an open source implementation of the Microsoft XNA 4 Framework.
BYOND - BYOND is the premier community for making and playing online multiplayer games.
ct.js - ct.js is a 2D game editor (desktop app) based on web technologies.
Corona SDK - Cross-platform mobile app development.